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Date: Thu, 21 Jun 2018 13:54:16 +0200
From: Sven Schwedas <sven.schwedas@....at>
To: oss-security@...ts.openwall.com
Subject: Re: Intel hyper-threading security issues

On 2018-06-21 12:28, Lukas Odzioba wrote:
> 2018-06-21 12:22 GMT+02:00 Lukas Odzioba <lukas.odzioba@...il.com>:
>> If you feel like you really need that, on Linux you can dump SRAT ACPI
>> table decompile it, remove APICID entries of "ht processors", compile
>> it back and put into initrd.
>> https://www.kernel.org/doc/Documentation/acpi/initrd_table_override.txt
> 
> Or use cpu hotplug mechanism, which should be way more convenient:
> https://www.kernel.org/doc/html/v4.17/core-api/cpu_hotplug.html
> 

Hotplug doesn't seem differentiate between HT threads and physical
cores, will setting maxcpus=2 on a 2 cores+HT machine reliably disable
HT, or can it disable one core and keep HT active on the other?



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